If there is shader mods for 1.13 and they support Forge then fair enough but for 1.14 using Fabric I don't see happening, and Forge 1.13.2 isn't 'ready yet' it's in public beta after all and devs are still adjusting to it so I don't expect any to be available until things are in proper shape.

They are appearing now, I don't know how many of them are coming about due to the preview of optifine being recent but yeah you can get it going I assume. Even with Fabric mods if you want (even if OptiFabric itself isn't supported anymore).